State profile · Near median Poor share

New Hampshire bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in New Hampshire.

2,542
Public bridges
51.6%
Good condition
7.5%
Poor condition

New Hampshire holds 2,542 public highway bridges (#44 of 52 by inventory) with a 7.51% Poor share (#18 of 52 by Poor share).

That is 7.5% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 35 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

2,542

Public highway bridges in New Hampshire

Good Condition

51.6%

1,312 bridges rated 7-9

1.6pp vs 50% benchmark

Poor Condition

7.5%

191 bridges whose lowest applicable component is rated 0-4

-0.0pp vs national avg 7.5%

New Hampshire vs national bridge condition

New Hampshire - Good condition share 51.6%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

New Hampshire - Poor-condition share 25.0%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

New Hampshire in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

New Hampshire vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

2,542 44th of 54 higher than 10 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for New Hampshire

The highlighted point is New Hampshire: 2,542 bridges and 7.51% in Poor condition, rank #35 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below New Hampshire on that same Poor-share ordering:

  • Montana: 5,224 bridges · 6.81% Poor
  • Kentucky: 14,548 bridges · 7.37% Poor
  • New Hampshire: 2,542 bridges · 7.51% Poor
  • Oklahoma: 22,917 bridges · 7.70% Poor
  • Alaska: 1,685 bridges · 7.89% Poor

The full national sortable table lives on the rankings page.

Material families in New Hampshire

Exclusive FHWA material families across all 2,542 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains New Hampshire’s inventory

State agency holds 58.0% of the 2,542 public highway bridges filed under New Hampshire in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When New Hampshire’s bridges were built

Pre-1950 construction accounts for 26.2% of the 2,542 bridges with a recorded original year in New Hampshire. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

New Hampshire51.6%40.9%GoodFairPoor
Bridge inventory deck-condition mix - New Hampshire (FHWA NBI)

Counties (10)

Belknap 112 Carroll 193 Cheshire 192 Coos 188 Grafton 544 Hillsborough 385 Merrimack 326 Rockingham 308 Strafford 136 Sullivan 158

New Hampshire vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below New Hampshire on the same metric.

MT

Montana

6.81% top marginal rate
Structure
Progressive
Burden @ $100K
$5,224

KY

Kentucky

7.37% top marginal rate
Structure
Progressive
Burden @ $100K
$14,548
Selected

NH

New Hampshire

7.51% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

OK

Oklahoma

7.70% top marginal rate
Structure
Progressive
Burden @ $100K
$22,917

AK

Alaska

7.89% top marginal rate
Structure
Progressive
Burden @ $100K
$1,685

Bridges Needing Most Attention in New Hampshire

Six lowest-condition bridges in New Hampshire, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

THORNTONS FERRY RD

Poor

Over: BEAVER BROOK

3.2 MI FR MERRIMACK TL, Hillsborough, NH

Built 1970 Load: 0.0 t ADT: 388

GRIST MILL HILL RD

Poor

Over: INDIAN RIVER

2.01 MI FROM GRAFTON TL, Grafton, NH

Built 1956 Load: 0.0 t ADT: 404

GRANITE ROAD

Poor

Over: SOUTH RIVER

0.3MI. RTE 153, Carroll, NH

Built 1920 Load: 0.0 t ADT: 90

OLD COUNTY RD N

Poor

Over: COLLINS BROOK

2.4 MI. DEERING TL, Hillsborough, NH

Built 1981 Load: 0.0 t ADT: 90

SOUTH ROAD

Poor

Over: MINNEWAWA BROOK

0.9 MI FR DUBLIN TL, Cheshire, NH

Built 1950 Load: 0.0 t ADT: 90

STEARNS BROOK ROAD

Poor

Over: STEARNS BROOK

0.4 MI FR SUCCESS TL, Coos, NH

Built 1950 Load: 0.0 t ADT: 90

All Bridges in New Hampshire

NO DATA ENTERED

Fair

Over: BUNGA JAR

NO DATA ENTERED, Grafton, NH

Built 2007 Load: 14.3 t ADT: 50

DIAMOND POND ROAD

Fair

Over: MOHAWK RIVER

0.14 MI NE JCT NH 26, Coos, NH

Built 1929 Load: 14.5 t ADT: 496

MAPLE STREET

Fair

Over: COLD BROOK

2.2 MI NE EFFINGHAM TL, Carroll, NH

Built 1922 Load: 14.5 t ADT: 250

NORTH GROTON ROAD

Fair

Over: SMALL BROOK

2.4 MI FROM HEBRON TL, Grafton, NH

Built 1927 Load: 14.5 t ADT: 170

CORBIN BRIDGE ROAD

Fair

Over: CROYDON BRANCH SUGAR R

.69 MI JCT NH 10, Sullivan, NH

Built 1845 Load: 14.5 t ADT: 529

OSSIPEE MT ROAD

Fair

Over: LOVELL RIVER

0.12 MI FR PINE HILL RD, Carroll, NH

Built 1951 Load: 14.5 t ADT: 90

STINSON LAKE ROAD

Fair

Over: STINSON BROOK

1.6 MI S OF ELLSWORTH TL, Grafton, NH

Built 1927 Load: 14.5 t ADT: 840

UPPER ROAD

Fair

Over: BEARCAMP RIVER

2.1 MI FROM NH RTE 113, Carroll, NH

Built 1950 Load: 14.5 t ADT: 90

DEER MEADOW ROAD

Fair

Over: DEER MEADOW BROOK

1.90MI CONCORD TL, Merrimack, NH

Built 1935 Load: 14.5 t ADT: 558

DANIELS ROAD

Fair

Over: OLIVERIAN BROOK

140 FT FR NH RTE 25, Grafton, NH

Built 1978 Load: 14.9 t ADT: 90

NO DATA ENTERED

Fair

Over: TUNNEL STREAM SALE

NO DATA ENTERED, Grafton, NH

Built 2015 Load: 14.9 t ADT: 99

VALLEY CROSS ROAD

Fair

Over: WILDCAT BROOK

0.04MI RTE 16B, Carroll, NH

Built 1905 Load: 15.0 t ADT: 192

HARTSHORN ROAD

Fair

Over: CROOKED RUN BROOK

.6 MILES W OF GRAY RD., Belknap, NH

Built 2003 Load: 15.1 t ADT: 90

RUDDSBORO ROAD

Fair

Over: MINK BROOK

4.4 MI FR LEBANON TL, Grafton, NH

Built 1946 Load: 15.1 t ADT: 90

US302 NH 10

Fair

Over: AMMONOOSUC RIVER

2.9 MI LANDAFF TL, Grafton, NH

Built 1980 Load: 15.1 t ADT: 5,186

NH101

Fair

Over: BLOOD BROOK

2.32 MI. E. PETERBORO TL, Hillsborough, NH

Built 1931 Load: 15.1 t ADT: 6,845

CHASE ROAD

Fair

Over: ORE HILL BROOK

O.1 MI WEST NH 25, Grafton, NH

Built 1950 Load: 15.2 t ADT: 90

ANTRIM ROAD

Fair

Over: CONTOOCOOK RIVER

0.05 MI FR CONTOOCOOK VA, Hillsborough, NH

Built 1929 Load: 15.4 t ADT: 2,291

HIGHLAND AVENUE

Fair

Over: BEAVER BROOK

0.7 MI. NH 28, Rockingham, NH

Built 1935 Load: 15.4 t ADT: 745

WHITEFACE INTERVAL

Fair

Over: WHITEFACE RIVER

0.4 MI FR BENNETT ST, Carroll, NH

Built 1950 Load: 15.4 t ADT: 78

US 3

Fair

Over: CONNECTICUT RIVER

PITTSBURG TL, Coos, NH

Built 1931 Load: 15.5 t ADT: 1,406

LAING ROAD

Fair

Over: WARNER RIVER

60 FT FROM NH RTE 103, Merrimack, NH

Built 1980 Load: 15.9 t ADT: 90

NH116

Fair

Over: CLARK BROOK

.06 MI JCT 10, Grafton, NH

Built 1961 Load: 16.1 t ADT: 3,639

RIVER ROAD

Fair

Over: COLD RIVER

0.97 MI NO JCT NH 123A, Sullivan, NH

Built 1929 Load: 16.3 t ADT: 174

LAWRENCE ROAD

Fair

Over: BLACKWATER RIVER

0.3 MI NH 11, Merrimack, NH

Built 1930 Load: 16.3 t ADT: 614

US 4

Fair

Over: BLACKWATER RIVER

1.7 MI FROM SALISBURY TL, Merrimack, NH

Built 1933 Load: 16.3 t ADT: 2,163

NH113

Fair

Over: CHARLES BROOK

2.0 MI S OF MAINE SL, Carroll, NH

Built 1938 Load: 16.3 t ADT: 343

PLATT ROAD

Fair

Over: BLOW-ME-DOWN BROOK

0.9 MI FR PLAINFIELD TL, Sullivan, NH

Built 1930 Load: 16.3 t ADT: 81

CENTER ROAD

Fair

Over: MILL BROOK

3.5 MI N OF NH12A, Sullivan, NH

Built 1950 Load: 16.3 t ADT: 147

JEFFERSON NOTCH RD

Fair

Over: CLAY BROOK

4.7 MI RT 302, Coos, NH

Built 1973 Load: 16.3 t ADT: 90

WILD MEADOW ROAD

Fair

Over: WILD MEADOW BROOK

0.3 MI GRAFTON TL, Merrimack, NH

Built 1950 Load: 16.3 t ADT: 90

WALKER BROOK ROAD

Fair

Over: FRAZIER BROOK

2.03 MI FR WILMOT TL, Merrimack, NH

Built 1950 Load: 16.3 t ADT: 90

WASHINGTON STREET

Fair

Over: CSX

0.7 MI FROM JCT NH9, Strafford, NH

Built 1907 Load: 16.3 t ADT: 5,401

DOW AVENUE

Fair

Over: GALE RIVER

0.5 MI. RTE 116, Grafton, NH

Built 1910 Load: 16.3 t ADT: 208

US 3 NH 11

Fair

Over: WINNIPESAUKEE RIVER

4.8MI FROM FRANKLIN T.L., Merrimack, NH

Built 1922 Load: 16.3 t ADT: 12,725

BROOK ROAD

Fair

Over: GUNNISON BROOK

.32 MI NE OF JCT NH 10, Sullivan, NH

Built 1940 Load: 16.3 t ADT: 991

RIDDLE HILL ROAD

Fair

Over: SMITH RIVER

0.17MI. RTE 4, Grafton, NH

Built 1977 Load: 16.3 t ADT: 139

SLAB CITY ROAD

Fair

Over: SMITH BROOK

TOWN RD, Grafton, NH

Built 1930 Load: 16.3 t ADT: 90

WILD MEADOWS ROAD

Fair

Over: BROOK

TOWN RD, Grafton, NH

Built 1980 Load: 16.3 t ADT: 90

NORTH SHORE ROAD

Fair

Over: COCKERMOUTH RIVER

1.74 MI. FROM JCT RTE 3-A, Grafton, NH

Built 1930 Load: 16.3 t ADT: 1,455

SHEDD ROAD

Fair

Over: SHEDD BROOK

0.2 MI FR NH RTE 31, Hillsborough, NH

Built 1919 Load: 16.3 t ADT: 90

ROXBURY ROAD

Fair

Over: OTTER BROOK

ROXBURY TL, Cheshire, NH

Built 1950 Load: 16.3 t ADT: 1,562

US 3 BUS NH107

Fair

Over: JEWETT BROOK

1.7 MI N. BELMONT T.L., Belknap, NH

Built 1979 Load: 16.3 t ADT: 10,392

BISHOP ROAD

Fair

Over: MILL BROOK

1.3 MI FROM LYMAN TL, Grafton, NH

Built 1970 Load: 16.3 t ADT: 115

RIVER ROAD

Fair

Over: SALMON HOLE BROOK

0.3 MI FROM NH RTE 117, Grafton, NH

Built 1920 Load: 16.3 t ADT: 250

BREEZY HILL ROAD

Fair

Over: SALMON HOLE BROOK

0.3 MI FROM GULF RD NO 6, Grafton, NH

Built 1975 Load: 16.3 t ADT: 90

MARKET STREET

Fair

Over: GRANT BROOK

4.0 MI FR HANOVER TL, Grafton, NH

Built 1974 Load: 16.3 t ADT: 71

OLD ROXBURY ROAD

Fair

Over: MINNEWAWA BROOK

0.6 MI. RTE. 101, Cheshire, NH

Built 1952 Load: 16.3 t ADT: 90

ROCHESTER NECK RD

Fair

Over: ISINGLASS RIVER

1.95 MI RTE 125, Strafford, NH

Built 1979 Load: 16.3 t ADT: 1,094

MIDDLE ROAD

Fair

Over: BEARCAMP RIVER

0.6 MI FROM NH RTE 113, Carroll, NH

Built 1960 Load: 16.3 t ADT: 90

Showing 51-100 of 2,542 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

Read our methodology — how this data is sourced, computed, and verified.

What to do with this

Use New Hampshire's inventory picture to drill to a county or a specific span.

  • Browse counties in New Hampshire and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. New Hampshire Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.